This patch fixes SLiM so it really waits for the X server to be ready
before attempting to connect to it.  Indeed, the X server notices that
its parent process has a handler for SIGUSR1, and consequently sends it
SIGUSR1 when it's ready to accept connections.

The problem was that SLiM doesn't pay attention to SIGUSR1.  So in practice,
if X starts slowly, then SLiM gets ECONNREFUSED a couple of time on
/tmp/.X11-unix/X0, then goes on trying to connect to localhost:6000,
where nobody answers; eventually, it times out and tries again on
/tmp/.X11-unix/X0, and finally it shows up on the screen.

Patch by L. Courtès.

--- slim-1.3.6/app.cpp	2014-02-05 15:27:20.000000000 +0100
+++ slim-1.3.6/app.cpp	2014-02-09 22:42:04.000000000 +0100
@@ -119,7 +119,9 @@ void CatchSignal(int sig) {
 	exit(ERR_EXIT);
 }
 
+static volatile int got_sigusr1 = 0;
 void User1Signal(int sig) {
+	got_sigusr1 = 1;
 	signal(sig, User1Signal);
 }
 
@@ -884,6 +886,7 @@ int App::WaitForServer() {
 	int	ncycles	 = 120;
 	int	cycles;
 
+	while (!got_sigusr1);
 	for(cycles = 0; cycles < ncycles; cycles++) {
 		if((Dpy = XOpenDisplay(DisplayName))) {
 			XSetIOErrorHandler(xioerror);
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<div class='path'>path: <a href='/guix/log/?id=38de3de40de847baf718d1df7664de2360ef3a6b'>root</a>/<a href='/guix/log/build-aux?id=38de3de40de847baf718d1df7664de2360ef3a6b'>build-aux</a>/<a href='/guix/log/build-aux/check-channel-news.scm?id=38de3de40de847baf718d1df7664de2360ef3a6b'>check-channel-news.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/check-channel-news.scm?id=38de3de40de847baf718d1df7664de2360ef3a6b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-05-22 00:35:23 +0200'>2020-05-22</span></td><td><a href='/guix/commit/build-aux/check-channel-news.scm?id=1ad5209d904d471ded6cf53b4e29b64e963dea3f'>maint: Add "make check-channel-news".</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/check-channel-news.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
(check-channel-news): New phony rule.
* doc/contributing.texi (Commit Access): Mention "make check-channel-news".
</span></span></td><td>Ludovic Courtès</td></tr>